import requests
import os

url="http://img.plantphoto.cn/image2/b/4034846.jpg"
#url = "https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png"
root = "R://python//"
path = root + url.split("/")[-1]
try:
    if not os.path.exists(root):
        os.mkdir(root)
    if not os.path.exists(path):
        #login_res = requests.post(
        url= "https://mp.weixin.qq.com/cgi-bin/login?lang=zh_CN",

        headers={

        "Host": "img.plantphoto.cn",
        "Proxy - Connection": "keep - alive",
        "Referer": "http: // www.plantphoto.cn / tu / 4034846",
        "User - Agent":" Mozilla / 5.0(Windows NT10.0;WOW64) AppleWebKit / 537.36(KHTML, like Gecko) Chrome / 67.0.3396.99 Safari / 537.36"
        }


        r = requests.get(url)
        r.raise_for_status()
        #使用with语句可以不用自己手动关闭已经打开的文件流
        with open(path,"wb") as f: #开始写文件，wb代表写二进制文件
            f.write(r.content)
        print("爬取完成")
    else:
        print("文件已存在")
except Exception as e:
    print("爬取失败:"+str(e))